Replace hardcoded charsets with StandardCharsets

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/JdbcExecutionContextDao.java

@@ -354,7 +354,7 @@ private String serializeContext(ExecutionContext ctx) {
 
 		try {
 			serializer.serialize(m, out);
-			results = new String(out.toByteArray(), charset.name());
+			results = out.toString(charset);
 		}
 		catch (IOException ioe) {
 			throw new IllegalArgumentException("Could not serialize the execution context", ioe);
@@ -374,7 +374,7 @@ public ExecutionContext mapRow(ResultSet rs, int i) throws SQLException {
 
 			Map<String, Object> map;
 			try {
-				ByteArrayInputStream in = new ByteArrayInputStream(serializedContext.getBytes(charset.name()));
+				ByteArrayInputStream in = new ByteArrayInputStream(serializedContext.getBytes(charset));
 				map = serializer.deserialize(in);
 			}
 			catch (IOException ioe) {

spring-batch-infrastructure/src/test/java/org/springframework/batch/support/transaction/TransactionAwareBufferedWriterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
+import java.nio.charset.StandardCharsets;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -41,6 +42,7 @@
  * @author Michael Minella
  * @author Will Schipp
  * @author Niels Ferguson
+ * @author Mahmoud Ben Hassine
  *
  */
 class TransactionAwareBufferedWriterTests {
@@ -301,7 +303,7 @@ void testResourceKeyCollision() throws Exception {
 			FileChannel fileChannel = mock(FileChannel.class);
 			when(fileChannel.write(any(ByteBuffer.class))).thenAnswer(invocation -> {
 				ByteBuffer buffer = (ByteBuffer) invocation.getArguments()[0];
-				String val = new String(buffer.array(), "UTF-8");
+				String val = new String(buffer.array(), StandardCharsets.UTF_8);
 				if (results[index] == null) {
 					results[index] = val;
 				}

spring-batch-samples/src/test/java/org/springframework/batch/sample/MultilineJobFunctionalTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
 
 package org.springframework.batch.sample;
 
+import java.nio.charset.StandardCharsets;
+
 import org.apache.commons.io.IOUtils;
 import org.junit.jupiter.api.Test;
 
@@ -45,8 +47,9 @@ class MultilineJobFunctionalTests {
 	@Test
 	void testJobLaunch() throws Exception {
 		this.jobLauncherTestUtils.launchJob();
-		assertEquals(EXPECTED_RESULT, StringUtils.replace(IOUtils.toString(output.getInputStream(), "UTF-8"),
-				System.getProperty("line.separator"), ""));
+		assertEquals(EXPECTED_RESULT,
+				StringUtils.replace(IOUtils.toString(output.getInputStream(), StandardCharsets.UTF_8),
+						System.getProperty("line.separator"), ""));
 	}
 
 }